For Newtok. Prepared For. March 16, 2012 ANTHC DEHE

Transcription

1 Comprehensive Energy Audit For Newtok Triball Court Prepared For Newtok Village March 16, 2012 Prepared By: ANTHC DEHE 1901 Bragaw Suite 200 Anchorage, Alaska

2 Table of Contents 1. EXECUTIVE SUMMARY AUDIT AND ANALYSIS BACKGROUND Program Description Audit Description Method of Analysis Limitations of Study Newtok Tribal Court Building Description Predicted Energy Use Energy Usage / Tariffs Energy Use Index (EUI) AkWarm Building Simulation ENERGY COST SAVING MEASURES Summary of Results Interactive Effects of Projects Appendix A Listing of Energy Conservation and Renewable Energy Websites Appendix B Direct Vent Oil Heater Programming PREFACE The Energy Projects Group at the Alaska Native Tribal Health Consortium (ANTHC) prepared this document for the Newtok Village. The authors of this report are Chris Mercer, Certified Energy Auditor (CEA) and Gavin Dixon. The purpose of this report is to provide a comprehensive document that summarizes the findings and analysis that resulted from an energy audit conducted over the past couple months by the Energy Projects Group of ANTHC. This report analyzes historical energy use and identifies costs and savings of recommended energy efficiency measures. Discussions of site specific concerns and an Energy Efficiency Action Plan are also included in this report. ACKNOWLEDGMENTS The Energy Projects Group gratefully acknowledges the assistance of Stanley Tom, Tribal Administrator. 2

3 1. EXECUTIVE SUMMARY This report was prepared for the Newtok Village. The scope of the audit focused on Newtok Tribal Court. The scope of this report is a comprehensive energy study, which included an analysis of building shell, interior and exterior lighting systems, HVAC systems, and plug loads. Based on electricity and fuel oil prices in effect at the time of the audit, the annual predicted energy costs for the buildings analyzed are $1,350 for Electricity, $2,897 for #1 Oil. The total energy costs are $4,247 per year. It should be noted that this facility did not receive the power cost equalization (PCE) subsidy from the state of Alaska last year. If it had received PCE, the total electrical costs would have been $794. Table 1.1 below summarizes the energy efficiency measures analyzed for the Newtok Tribal Court. Listed are the estimates of the annual savings, installed costs, and two different financial measures of investment return. Table 1.1 PRIORITY LIST ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description 1 Other Electrical: Shut off computers when Computers not in use. 2 Setback Thermostat: Implement a Heating Tribal Court Temperature Unoccupied Setback to 60.0 deg F for the Tribal Court space. 3 Air Tightening: Attic Access Perform air sealing to reduce air leakage by 50 CFM at 50 Pascals. Replace lighting fixtures with 4 foot LED bulbs. Add R-21 fiberglass batts to attic with Standard Truss. Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR 1 Simple Payback (Years) 2 $83 $ $308 $ $69 $ Lighting: Building Lighting $344 $ Ceiling w/ Attic: Tribal $181 $2, Court TOTAL, all measures $985 $3, Table Notes: 1 Savings to Investment Ratio (SIR) is a life cycle cost measure calculated by dividing the total savings over the life of a project (expressed in today s dollars) by its investment costs. The SIR is an indication of the profitability of a measure; the higher the SIR, the more profitable the project. An SIR greater than 1.0 indicates a cost effective project (i.e. more savings than cost). Remember that this profitability is based on the position of that Energy Efficiency Measure (EEM) in the overall list and assumes that the measures above it are implemented first. 2 Simple Payback (SP) is a measure of the length of time required for the savings from an EEM to payback the investment cost, not counting interest on the investment and any future changes in 3

4 energy prices. It is calculated by dividing the investment cost by the expected first year savings of the EEM. With all of these energy efficiency measures in place, the annual utility cost can be reduced by $985 per year, or 23.2% of the buildings total energy costs. These measures are estimated to cost $3,591, for an overall simple payback period of 3.6 years. Table 1.2 below is a breakdown of the annual energy cost across various energy end use types, such as Space Heating and Water Heating. The first row in the table shows the breakdown for the building as it is now. The second row shows the expected breakdown of energy cost for the building assuming all of the retrofits in this report are implemented. Finally, the last row shows the annual energy savings that will be achieved from the retrofits. Description Space Heating Space Cooling Water Heating Lighting Table 1.2 Annual Energy Cost Estimate Refrigera tion Other Electrical Cooking Clothes Drying Ventilatio n Fans Service Fees Total Cost Existing $3,042 $0 $0 $716 $0 $490 $0 $0 $0 $0 $4,247 Building With All $2,631 $0 $0 $254 $0 $377 $0 $0 $0 $0 $3,262 Proposed Retrofits SAVINGS $411 $0 $0 $462 $0 $112 $0 $0 $0 $0 $ AUDIT AND ANALYSIS BACKGROUND 2.1 Program Description This audit included services to identify, develop, and evaluate energy efficiency measures at the Newtok Tribal Court. The scope of this project included evaluating building shell, lighting and other electrical systems, and HVAC equipment, motors and pumps. Measures were analyzed based on life cycle cost techniques, which include the initial cost of the equipment, life of the equipment, annual energy cost, annual maintenance cost, and a discount rate of 3.0%/year in excess of general inflation. 2.2 Audit Description Preliminary audit information was gathered in preparation for the site survey. The site survey provides critical information in deciphering where energy is used and what opportunities exist within a building. The entire site was surveyed to inventory the following to gain an understanding of how each building operates: Building envelope (roof, windows, etc.) Heating, ventilation, and air conditioning equipment (HVAC) Lighting systems and controls 4

5 Building specific equipment The building site visit was performed to survey all major building components and systems. The site visit included detailed inspection of energy consuming components. Summary of building occupancy schedules, operating and maintenance practices, and energy management programs provided by the building manager were collected along with the system and components to determine a more accurate impact on energy consumption. Details collected from Newtok Tribal Court enable a model of the building s energy usage to be developed, highlighting the building s total energy consumption, energy consumption by specific building component, and equivalent energy cost. The analysis involves distinguishing the different fuels used on site, and analyzing their consumption in different activity areas of the building. Newtok Tribal Court is classified as being made up of the following activity areas: 1) Tribal Court: 437 square feet In addition, the methodology involves taking into account a wide range of factors specific to the building. These factors are used in the construction of the model of energy used. The factors include: Occupancy hours Local climate conditions Prices paid for energy 2.3. Method of Analysis Data collected was processed using AkWarm Energy Use Software to estimate energy savings for each of the proposed energy efficiency measures (EEMs). The recommendations focus on the building envelope; HVAC; lighting, plug load, and other electrical improvements; and motor and pump systems that will reduce annual energy consumption. EEMs are evaluated based on building use and processes, local climate conditions, building construction type, function, operational schedule, existing conditions, and foreseen future plans. Energy savings are calculated based on industry standard methods and engineering estimations. Our analysis provides a number of tools for assessing the cost effectiveness of various improvement options. These tools utilize Life Cycle Costing, which is defined in this context as a method of cost analysis that estimates the total cost of a project over the period of time that includes both the construction cost and ongoing maintenance and operating costs. Savings to Investment Ratio (SIR) = Savings divided by Investment Savings includes the total discounted dollar savings considered over the life of the improvement. When these savings are added up, changes in future fuel prices as projected by the Department of Energy are included. Future savings are discounted to the present to account for the time value of money (i.e. money s ability to earn interest over time). The 5

6 Investment in the SIR calculation includes the labor and materials required to install the measure. An SIR value of at least 1.0 indicates that the project is cost effective total savings exceed the investment costs. Simple payback is a cost analysis method whereby the investment cost of a project is divided by the first year s savings of the project to give the number of years required to recover the cost of the investment. This may be compared to the expected time before replacement of the system or component will be required. For example, if a boiler costs $12,000 and results in a savings of $1,000 in the first year, the payback time is 12 years. If the boiler has an expected life to replacement of 10 years, it would not be financially viable to make the investment since the payback period of 12 years is greater than the project life. The Simple Payback calculation does not consider likely increases in future annual savings due to energy price increases. As an offsetting simplification, simple payback does not consider the need to earn interest on the investment (i.e. it does not consider the time value of money). Because of these simplifications, the SIR figure is considered to be a better financial investment indicator than the Simple Payback measure. Measures are implemented in order of cost effectiveness. The program first calculates individual SIRs, and ranks all measures by SIR, higher SIRs at the top of the list. An individual measure must have an individual SIR>=1 to make the cut. Next the building is modified and resimulated with the highest ranked measure included. Now all remaining measures are reevaluated and ranked, and the next most cost effective measure is implemented. AkWarm goes through this iterative process until all appropriate measures have been evaluated and installed. It is important to note that the savings for each recommendation is calculated based on implementing the most cost effective measure first, and then cycling through the list to find the next most cost effective measure. Implementation of more than one EEM often affects the savings of other EEMs. The savings may in some cases be relatively higher if an individual EEM is implemented in lieu of multiple recommended EEMs. For example implementing a reduced operating schedule for inefficient lighting will result in relatively high savings. Implementing a reduced operating schedule for newly installed efficient lighting will result in lower relative savings, because the efficient lighting system uses less energy during each hour of operation. If multiple EEM s are recommended to be implemented, AkWarm calculates the combined savings appropriately. Cost savings are calculated based on estimated initial costs for each measure. Installation costs include labor and equipment to estimate the full up front investment required to implement a change. Costs are derived from Means Cost Data, industry publications, and local contractors and equipment suppliers. 2.4 Limitations of Study All results are dependent on the quality of input data provided, and can only act as an approximation. In some instances, several methods may achieve the identified savings. This report is not intended as a final design document. The design professional or other persons following the recommendations shall accept responsibility and liability for the results. 6

7 3. Newtok Tribal Court 3.1. Building Description The 437 square foot Newtok Tribal Court was constructed in 1980, with a normal occupancy of 3 people. The number of hours of operation for this building average 3.4 hours per day, considering all seven days of the week. Description of Building Shell The exterior walls are 2x6 construction with 5.5 inches of damaged batt insulation, The building has a cold roof with 6 inches of damaged batt insulation. The floor of the building is built on pilings with 6 inches of damaged batt insulation. Typical windows throughout the building are 4x3 with broken glass and plastic stretched across to prevent air leakage or boarded over. Doors are metal with a urethane core. Description of Heating Plants The Heating Plants used in the building are: Monitor 2400 Fuel Type: #1 Oil Input Rating: 43,000 BTU/hr Steady State Efficiency: 87 % Idle Loss: 0 % Heat Distribution Type: Air Space Heating Distribution Systems Heat in the building is supplied solely by a monitor heater. Lighting Lighting in the building is made up of T12 34 watt fluorescent lighting. Plug Loads A pair of desktop computers with monitors, a few phones, a PA system and a cell phone charger makes up the majority of the plug loads in the facility. 7

8 3.2 Predicted Energy Use Energy Usage / Tariffs The electric usage profile charts (below) represents the predicted electrical usage for the building. If actual electricity usage records were available, the model used to predict usage was calibrated to approximately match actual usage. The electric utility measures consumption in kilowatt hours (kwh) and maximum demand in kilowatts (kw). One kwh usage is equivalent to 1,000 watts running for one hour. The fuel oil usage profile shows the fuel oil usage for the building. Fuel oil consumption is measured in gallons. One gallon of #1 Fuel Oil provides approximately 132,000 BTUs of energy. The following is a list of the utility companies providing energy to the building and the class of service provided: Electricity: Unqusrag Commercial Sm The average cost for each type of fuel used in this building is shown below in Table 3.1. This figure includes all surcharges, subsidies, and utility customer charges: Table 3.1 Average Energy Cost Description Average Energy Cost Electricity $ 0.83/kWh #1 Oil $ 7.20/gallons Total Energy Use and Cost Breakdown At current rates, Newtok Village pays approximately $4,247 annually for electricity and other fuel costs for the Newtok Tribal Court. Figure 3.1 below reflects the estimated distribution of costs across the primary end uses of energy based on the AkWarm computer simulation. Comparing the Retrofit bar in the figure to the Existing bar shows the potential savings from implementing all of the energy efficiency measures shown in this report. 8

9 Figure 3.1 Annual Energy Costs by End Use Annual Energy Costs by End Use $5,000 $4,000 Space Heating Other Electrical Lighting $3,000 $2,000 $1,000 $0 Existing Retrofit Figure 3.2 below shows how the annual energy cost of the building splits between the different fuels used by the building. The Existing bar shows the breakdown for the building as it is now; the Retrofit bar shows the predicted costs if all of the energy efficiency measures in this report are implemented. Figure 3.2 Annual Energy Costs by Fuel Type Figure 3.3 below addresses only Space Heating costs. The figure shows how each heat loss component contributes to those costs; for example, the figure shows how much annual space heating cost is caused by the heat loss through the Walls/Doors. For each component, the space heating cost for the Existing building is shown (blue bar) and the space heating cost assuming all retrofits are implemented (yellow bar) are shown. 9

10 Figure 3.3 Annual Space Heating Cost by Component The tables below show AkWarm s estimate of the monthly fuel use for each of the fuels used in the building. For each fuel, the fuel use is broken down across the energy end uses. Note, in the tables below DHW refers to Domestic Hot Water heating. Electrical Consumption (kwh) Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Lighting Other_Electrical Space_Heating Fuel Oil #1 Consumption (Gallons) Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Space_Heating Energy Use Index (EUI) Energy Use Index (EUI) is a measure of a building s annual energy utilization per square foot of building. This calculation is completed by converting all utility usage consumed by a building for one year, to British Thermal Units (Btu) or kbtu, and dividing this number by the building square footage. EUI is a good measure of a building s energy use and is utilized regularly for comparison of energy performance for similar building types. The Oak Ridge National Laboratory (ORNL) Buildings Technology Center under a contract with the U.S. Department of Energy maintains a Benchmarking Building Energy Performance Program. The ORNL website determines how a building s energy use compares with similar facilities throughout the U.S. and in a specific region or state. Source use differs from site usage when comparing a building s energy consumption with the national average. Site energy use is the energy consumed by the building at the building site 10

11 only. Source energy use includes the site energy use as well as all of the losses to create and distribute the energy to the building. Source energy represents the total amount of raw fuel that is required to operate the building. It incorporates all transmission, delivery, and production losses, which allows for a complete assessment of energy efficiency in a building. The type of utility purchased has a substantial impact on the source energy use of a building. The EPA has determined that source energy is the most comparable unit for evaluation purposes and overall global impact. Both the site and source EUI ratings for the building are provided to understand and compare the differences in energy use. The site and source EUIs for this building are calculated as follows. (See Table 3.4 for details): Building Site EUI = (Electric Usage in kbtu + Fuel Oil Usage in kbtu + similar for other fuels) Building Square Footage Building Source EUI = (Electric Usage in kbtu X SS Ratio + Fuel Oil Usage in kbtu X SS Ratio + similar for other fuels) Building Square Footage where SS Ratio is the Source Energy to Site Energy ratio for the particular fuel. Table 3.4 Newtok Tribal Court EUI Calculations Energy Type Building Fuel Use per Year Site Energy Use per Year, kbtu Source/Site Ratio Source Energy Use per Year, kbtu Electricity 1,626 kwh 5, ,538 #1 Oil 402 gallons 53, ,650 Total 58,669 72,188 BUILDING AREA 437 Square Feet BUILDING SITE EUI 134 kbtu/ft²/yr BUILDING SOURCE EUI 165 kbtu/ft²/yr * Site Source Ratio data is provided by the Energy Star Performance Rating Methodology for Incorporating Source Energy Use document issued March AkWarm Building Simulation An accurate model of the building performance can be created by simulating the thermal performance of the walls, roof, windows and floors of the building. The HVAC system and central plant are modeled as well, accounting for the outside air ventilation required by the building and the heat recovery equipment in place. The model uses local weather data and is trued up to historical energy use to ensure its accuracy. The model can be used now and in the future to measure the utility bill impact of all types of energy projects, including improving building insulation, modifying glazing, changing air handler schedules, increasing heat recovery, installing high efficiency boilers, using variable air volume air handlers, adjusting outside air ventilation and adding cogeneration systems. For the purposes of this study, the Newtok Tribal Court was modeled using AkWarm energy use software to establish a baseline space heating and cooling energy usage. Climate data from Newtok was used for analysis. From this, the model was be calibrated to predict the impact of theoretical energy savings measures. Once annual energy savings from a particular measure 11

12 were predicted and the initial capital cost was estimated, payback scenarios were approximated. Equipment cost estimate calculations are provided in Appendix D. Limitations of AkWarm Models The model is based on typical mean year weather data for Newtok. This data represents the average ambient weather profile as observed over approximately 30 years. As such, the gas and electric profiles generated will not likely compare perfectly with actual energy billing information from any single year. This is especially true for years with extreme warm or cold periods, or even years with unexpectedly moderate weather. The heating and cooling load model is a simple two zone model consisting of the building s core interior spaces and the building s perimeter spaces. This simplified approach loses accuracy for buildings that have large variations in cooling/heating loads across different parts of the building. The model does not model HVAC systems that simultaneously provide both heating and cooling to the same building space (typically done as a means of providing temperature control in the space). The energy balances shown in Section 3.1 were derived from the output generated by the AkWarm simulations. 4. ENERGY COST SAVING MEASURES 4.1 Summary of Results The energy saving measures are summarized in Table 4.1. Please refer to the individual measure descriptions later in this report for more detail. Calculations and cost estimates for analyzed measures are provided in Appendix C. Table 4.1 Newtok Tribal Court, Newtok, Alaska PRIORITY LIST ENERGY EFFICIENCY MEASURES Rank Feature Improvement Description 1 Other Electrical: Shut off computers when Computers not in use. 2 Setback Thermostat: Implement a Heating Tribal Court Temperature Unoccupied Setback to 60.0 deg F for the Tribal Court space. 3 Air Tightening: Attic Access Perform air sealing to reduce air leakage by 50 cfm at 50 Pascals. Replace lighting fixtures with 4 foot LED bulbs. Add R-21 fiberglass batts to attic with Standard Truss. Annual Energy Savings Installed Cost Savings to Investment Ratio, SIR Simple Payback (Years) $83 $ $308 $ $69 $ Lighting: Building Lighting $344 $ Ceiling w/ Attic: Tribal $181 $2, Court TOTAL, all measures $985 $3,

13 4.2 Interactive Effects of Projects The savings for a particular measure are calculated assuming all recommended EEMs coming before that measure in the list are implemented. If some EEMs are not implemented, savings for the remaining EEMs will be affected. For example, if ceiling insulation is not added, then savings from a project to replace the heating system will be increased, because the heating system for the building supplies a larger load. In general, all projects are evaluated sequentially so energy savings associated with one EEM would not also be attributed to another EEM. By modeling the recommended project sequentially, the analysis accounts for interactive affects among the EEMs and does not double count savings. Interior lighting, plug loads, facility equipment, and occupants generate heat within the building. When the building is in cooling mode, these items contribute to the overall cooling demands of the building; therefore, lighting efficiency improvements will reduce cooling requirements in air conditioned buildings. Conversely, lighting efficiency improvements are anticipated to slightly increase heating requirements. Heating penalties and cooling benefits were included in the lighting project analysis. 4.3 Building Shell Measures Insulation Measures Rank Location Existing Type/R Value Recommendation Type/R Value 5 Ceiling w/ Attic: Tribal Court Framing Type: Standard Framing Spacing: 16 inches Insulated Sheathing: None Bottom Insulation Layer: R 19 Batt:FG or RW, 6 inches Top Insulation Layer: None Insulation Quality: Damaged Modeled R Value: 19.8 Add R 21 fiberglass batts to attic with Standard Truss. Installation Cost $2,781 Estimated Life of Measure (yrs) 30 Energy Savings (/yr) $181 Breakeven Cost $4,272 Savings to Investment Ratio 1.5 Simple Payback yrs 15 Auditors Notes: Adding insulation to the ceiling will reduce heating costs for the facility Air Sealing Measures Rank Location Existing Air Leakage Level (cfm@50/75 Pa) Recommended Air Leakage Reduction (cfm@50/75 Pa) 3 Attic Access Air Tightness estimated as: 650 cfm at 50 Pascals Perform air sealing to reduce air leakage by 50 cfm at 50 Pascals. Installation Cost $100 Estimated Life of Measure (yrs) 10 Energy Savings (/yr) $69 Breakeven Cost $639 Savings to Investment Ratio 6.4 Simple Payback yrs 1 Auditors Notes: Attic Access should be insulated and sealed tightly to prevent excess heat going into the attic. 13

14 4.4 Mechanical Equipment Measures Night Setback Thermostat Measures Rank Building Space Recommendation 2 Tribal Court Implement a Heating Temperature Unoccupied Setback to 60.0 deg F for the Tribal Court space. Installation Cost $200 Estimated Life of Measure (yrs) 15 Energy Savings (/yr) $308 Breakeven Cost $4,164 Savings to Investment Ratio 20.8 Simple Payback yrs 1 Auditors Notes: The monitor heater should be set to a temperature of 60 degrees when the facility is not actively being used, such as most nights and weekends. Monitor heaters have a built in automatic setback thermostat. Check the appendices for tools to set this setback thermostat. 4.5 Electrical & Appliance Measures Lighting Measures The goal of this section is to present any lighting energy conservation measures that may also be cost beneficial. It should be noted that replacing current bulbs with more energy efficient equivalents will have a small effect on the building heating and cooling loads. The building cooling load will see a small decrease from an upgrade to more efficient bulbs and the heating load will see a small increase, as the more energy efficient bulbs give off less heat a Lighting Measures Replace Existing Fixtures/Bulbs Rank Location Existing Condition Recommendation 4 Building Lighting 4 FLUOR (3) T12 4' F40T12 34W Energy Saver Magnetic with Manual Switching Replace with 4 LED (2) 17W Module Electronic Installation Cost $500 Estimated Life of Measure (yrs) 10 Energy Savings (/yr) $344 Breakeven Cost $2,836 Savings to Investment Ratio 5.7 Simple Payback yrs 1 Auditors Notes: Replacing Current lighting with LED bulbs and removing the ballast would increase lift expectancy of the bulbs, reduce energy use, and provide more light with less lamps Other Electrical Measures Rank Location Description of Existing Efficiency Recommendation 1 Computers 4 2 Desktops and 2 Monitors with Manual Switching Improve Manual Switching Installation Cost $10 Estimated Life of Measure (yrs) 7 Energy Savings (/yr) $83 Breakeven Cost $505 Savings to Investment Ratio 50.5 Simple Payback yrs 0 Auditors Notes: Make sure to turn computers off when leaving the office. You can use windows management settings to make the computer turn off after a certain amount of inactivity, allowing for automatic shutdown of the computer. 5. ENERGY EFFICIENCY ACTION PLAN 14

15 Through inspection of the energy using equipment on site and discussions with site facilities personnel, this energy audit has identified several energy saving measures. The measures will reduce the amount of fuel burned and electricity used at the site. The projects will not degrade the performance of the building and, in some cases, will improve it. Several types of EEMs can be implemented immediately by building staff, and others will require various amounts of lead time for engineering and equipment acquisition. In some cases, there are logical advantages to implementing EEMs concurrently. For example, if the same electrical contractor is used to install both lighting equipment and motors, implementation of these measures should be scheduled to occur simultaneously. Appendix A Listing of Energy Conservation and Renewable Energy Websites Lighting Illumination Engineering Society Energy Star Compact Fluorescent Lighting Program DOE Solid State Lighting Program DOE office of Energy Efficiency and Renewable Energy Energy Star Hot Water Heaters Heat Pump Water Heaters Solar Water Heating FEMP Federal Technology Alerts Solar Radiation Data Manual Plug Loads DOE office of Energy Efficiency and Renewable Energy Energy Star The Greenest Desktop Computers of greenest pcs of 2008.html Wind 15

16 AWEA Web Site National Wind Coordinating Collaborative Utility Wind Interest Group site: WPA Web Site Homepower Web Site: Windustry Project: Solar NREL Firstlook TMY or Weather Data /tmy3/ State and Utility Incentives and Utility Policies Appendix B Direct Vent Oil Heater Programming Using the temperature setbacks built into most direct vent oil heaters, such as Toyotomi Lasers and Monitor MPIs is a simple, cost effective way to save energy. We recommend setback temperatures of 60 degrees for nights and weekends in offices and other frequently occupied facilities. In buildings that are occupied intermittently, such as Bingo Halls, we recommend a setback of 50 or 55 degrees. Facilities that are never occupied, such as lift stations and well houses, should be setback to 40 degrees, to prevent freezeups. Check the following websites for tips on programming the built in temperature setback capabilities of your specific direct vent oil heater. support/manuals 16